摘要
随着边坡工程复杂性增加,边坡稳定性分析面临很大挑战。由于坡体滑动具有阶段性,抗滑力的组成也是动态变化的,提出用双安全系数来辨识坡体所处的状态。边坡失稳伴随坡体强度的变化,按其演化过程分为强稳定阶段、弱稳定阶段和破坏阶段。基于极限平衡原理计算常规安全系数(Fs)和安全系数1(Fs1),得到边坡稳定状态的判识:当安全系数1大于1时,坡体处于强稳定阶段;安全系数1小于且常规安全系数大于1时,坡体处于弱稳定阶段;常规安全系数小于1时,坡体处于破坏阶段。结合模型试验,得到对应坡体三个阶段的两个安全系数关系曲线,理论上证明了双安全系数方法的可行性。运用分段安全系数方法对已知边(滑)坡状态进行分析,并对其稳定状态进行判识,结果与实际工程地质相符,验证了双安全系数法的可行性。
Safety factor is an important parameter to represent the stability of slope. Therefore,double safety factor was put forward to recognize the state of slope due to the stage-change character of movement of slope. Slope situation was divided into three phases: strongly stable,weakly stable and totally destructed. The safety factors were deduced according to the limit equilibrium,and references of stability of slope were obtained as follow: When the safety factor 1( Fs1) was greater than 1,slope was in strongly stable phase. When the safety factor 1( Fs1) was less than 1 and the safety factor( Fs) was greater than 1,slope is in weakly stable phase. When the safety factor( Fs) was less than 1,slope was in totally destructed phase. Combined with the model experiments,two safety factors were obtained,and theoretically verify the effectiveness of method of double safety factors. This method was applied to recognize the stabilities of known slopes via the conversion analysis. The findings demonstrate well consistency with the actual monitoring results,which verify the reliability of method of double safety factors.
作者
吕夫侠
谢谟文
杜岩
陈晨
LV Fu-xia;XIE Mo-wen;DU Yan;CHEN Chen(School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China)
出处
《科学技术与工程》
北大核心
2019年第14期309-314,共6页
Science Technology and Engineering
基金
国家自然科学基金(41372370,41572274,41702371)资助
关键词
边坡
稳定性分析
状态判识
双安全系数
slope
stability analysis state
recognition
the double safety factors
